mybatis underlying operation database process (easy to understand)

Publicclass Mybatis_select { 

Publicstaticvoid main(String[] args) throws IOException {  

// mybatis configuration file

String resource = "sqlMapConfig.xml";

InputStream inputStream = Resources.getResourceAsStream(resource);

// Create sessionFactory using SqlSessionFactoryBuilder

SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);

// Get a Sqlsession through the session factory , sqlsession includes the sql method for database operations

SqlSession session = sqlSessionFactory.openSession();

try {

//通过sqlsession调用selectOne方法获取一条结果集

//参数1：指定定义的statement的id,参数2：指定向statement中传递的参数

User user = session.selectOne("test.selectUserById", 1);

System.out.println(user);

} finally{

session.close();

}

}

}

从上述的流程可以简单看出，mybatis的执行流程是：

1。通过文件流 inputStream和 SqlSessionFactoryBuilder获取到SqlSessionFactory ；

2。通过SqlSessionFactory 获取到SqlSession；

3。通过SqlSession 对数据库进行操作；